Grease-gun.



1. e. Manson GREASE GUN. APPLICATION FILED, DEC- l9ll- 1,275,455. IPatenmdAug.13,l918.

UNITED STATES PATENT OFFICE.

roan: c. imagines- 2931:, is. i.

Toallwhom itma concern:

Be it'knownt at JOHN G. MAcGnneon, aicitizenxof the United (States, andresident of thecity, county, and State ofNew York," hasginvented-certain' new 'anduseful Imrovem'ents in Grease-Guns, of which. the'ollowing is 51a specification. This "invention relates-to that class ofdevice'swhich are commonlvk'nown as grease and which comprise areceptacle adapted to hldgrea'se, or other material of a. "asty." or"semisolid nature, and are pro- M p} vi' edwithejecting means'wherebv then aterial may be forced irom the receptacle as desired;

ious novel features of the invention particularl eintedpout.

e. accompanying drawings, in which (its pref r d emb i e t is aerialsectional'view of a bodymg he inve horizontal section on the line l is adetailfaceviewof one foi-the e e; 1 a ahorizontal *sectionon the line1-. V i It'fis to he understood {that in describing myjdevice as agrease gun throughout the specification and claims', I employ this termfrconvenience innoinen lature and not in anywayginalimitingsensei Ashereshown, improved grease gun c6m'p'rises a cylindr cal receptacle 2 whoserear end is closed by af fixed non-removable head 3 secured' thereto inany suitable man ner asdindicatedat 4. I I "I he forward, fo rdischarge, end thereceptacle is closed. by a relatively rotata ble'capfi'jto which is secured a barrel 7 which [freely inclcses the forward,end of thegun.

Application 119a December, 1017. s rial m. scam.

.the head 8.

ently referred to, and 0 6 rotatably ngs, and,to theappended ,c imsinwhich I Specification ot Lettcrl Ila-tent. I Patented All g- 13, 1.918,v

I sleeve-washer 8,, of paper or like material, is preferably inter osedbetween-tho barrel 7 andthe-Wall oft e receptacle.

The cap*6 is provided with a discharge nozzle \9, which maybe screwedupon the neck 10 of the cap'6.

Extending axially through the receptacle from endltofend thereof is ahelix 12 which is fixed at ene'l end to the cap 6 and at its oppositeendhas a mp ian nesp nsm "way "a: some; this helix and *seeum g itn.rnplecelpreferably construct itof (a .pair of w1res twisted together,and separated adjacent the forwa'r end of the h gun into the oppositelypointing horizonal portions 13 whose ends projectthroughsuitable lat-Swivel connection with eral openings in the neck 10 ai1d mfayl-hesecured in place by soldering or otherwise. This helix Serves thepurpose both of ad-v vancin'g the follower or securing the cap "on theforward en' d of the cylt ter function is accomplished inder.

ening in the heads and s01- a washer 15. The'jpistoir" the disk 19is'cut out-on o POSltBYSIdBS to;

form shoulders21 and we ge surfaces 22, shown in Fig-.4, whosepurlposeis'toprevent rotation and, consequent end "of the helix friely' orfollower ishere shown as comprising a nut 17 threaded-on thehelix; 12and having-on one side a square boss 18 a 5 vancement ,of the pistonwhen the=hel1x is piston, tdbef presrotated in one directionw andprevent retrac- 7 tion of thexpiston when'the helix is rotated in anopposite direction; Formed on the ribs 20" are a series of-inwardlypointing projections 23. These pro'ections assist in preventing theretraction o the piston when" the wedge surfaces 22 are broughtiintoen-' gagement with the ribs 20 beneath oneof, the projections 23. Thecut-out port ons of I i the disk'19 at the points ajacent the-shoulders21 clears 'these projections 23, when the ribs 20, as shownin Fig.4, onthe upper side'of the metall c disk 19 forming apart of the piston, s asecon the shoulders 21 are in engagement with i v I disk 2'5,1wh'1ch maybe made of 'paperor',

other'like material, having a central open.

ing 26 through which the helix passes freely and peripheral notches 27to accommodate the ribs 20, as shown in F ig'. 3.

The manner of using my improved grease on is as follows: The receptacle2 may be filled by removing the nozzle 9 or after the cap 6 has beenslipped on the forward end, with the helix 12 projecting through therece tacle, but before the piston is placed on t e'hclix or the head 3secured in place. In the latter case, after filling, the piston is.placed on the helix, the disks '25 and placed on the end of the helixand the nut 17 then drawn into position by rotating the helix throu hthe medium of the cap 6 and barrel 7. he head 3 is then fixed in placeand the washer 15 soldered on the projecting end of the helix.

To discl'iarge the material, the helix 12 is rotated (by rotating thebarrel 7 relatively to the cylindrical receptacle'2) and 'the piston ismoved forwardly on the helix,

causing the contents of the gun to be grad-- ually ejected through thenozzle 9. It will be apparent that the rotation of the piston with thehelix will be prevented by the engagement of the shoulders 21 on thedisk 19 with the ribs 20 on the receptacle. If it is attempted to rotatethe helix in an opposite direction, either after the-con tents have beendischarged or at any intermediate point the wedge surface 22 on. the

disk 19 willbe moved into engagement with ribs-2Q and movement of thepiston rearwardly willbe prevented by the w'edging action and also byengagement ofthe latter with the rejections 23 on the ribs. It will thusbe 0 vious that refilling of the receptacle will be impossible withoutrupturing somepart thereof and also that operation of the piston in the.pro er direction to discharge the contents is a ways insured.

It may also be desirable to provide the wedge surfaces 22 on the disk 19with knife. edges sothat if rotated in a reverse direction the same willout into the ribs 20, thus cf fectnally preventing the retraction of thepiston. 3

As' a further revision and. protection a%ainst refilling, it will benoted that the T1 hasvbeen advanced to the upper orforward end of thereceptacle, in *which position the contents are practically alldischarged. the

above construction and inany apparently v widely diiferent embodimentsof my inventi-on designed--yvitliout departing from the G5.

scope of the appendcd'claims, I intend that said cylindrical receptacle,a 0

wall thereof and having 6.. In a grease gu-n incombination,- piston 1sreleased from engagement with the ;.:ceptacle,' a piston movablelongitudinally the helix"therein, means for movin said in in said recaptacle, and means comprising a series of all matter contained in theabove description or shown in the accompanying drawings shall beinterpreted as illustrative merely of an operative embodiment of myinvention and not in a limiting sense.

What'I claim is: i v

1. A grease gun comprising a completely closed receptacle, 'a. helixextending longitudinally therethrough, a follower adapted to be advancedin said receptacle by rotation of said helix, and cogacting devices provided on said follower and said. receptacle whereby retraction of helixis prevented. n

2; A grease gun comprisinga cylindrical receptacle closed at both. endsby means nonremovable except by rupture a'piston in llower, means foradvancing said follower in said receptacle, and co-acting devicesprovided on said follower and receptacle whereby retraction of thefollower is prevented,

3. A grease gun comprising a cylindrica receptacle, a piston therein, arotatable cap closing one mid of said' receptacle, and a helixosecurcdat one end to said cap and in said-follower by said threaded engagementwith said piston, said helix'serving to prevent displacement-"0f the capfrom the receptacle and comprisin aj pair of twisted wires secured atone en to said cap.

4. Atgrcase gun comprising a receptacle having a helix extending'lherethrough, a 7 piston devicein threaded engagement with- I saidhelix, said piston device presenting a shoulder and a wedge member, and.co actmg means on. said-"receptacle adapted to be engaged respectivelyby said shoulderv and wedge member upon n tation of the helix inopposite directions, for the "purpose 'set forth,

5.A grease gun comprising a receptacle havinga helixex'tendingtherethroligh, a piston device in 'threadcd engagem'ent withsaid helix. said iston devicepres'ent'. g. a

shonlder,and w v are*meinber, and co-act ng means on said receptacleadapted e'n-.

gaged respectively "by said shoulder 'and wedge member upon rotation ofthe heliii'nopposite dh-ectious for the purpose set s 20 do not extendto theextreme top of the receptacle 2, so that when the piston one.direction longitudinal y longitudinally spaced pri'ijecti'ons on saidreceptacle adapted to-be engaged by [said--' piston to preventlongitudinal "movement thereof in an opposite direction,

7 In'a grease gun, in combination areceptacle, a piston movablelongitudinally,

therein, said piston being provided with a knife edge portion, means formoving said piston in one direction longitudinally in said receptacle,and means adapted to cause said knife ed portion of said piston toengage a portion of said reoeptacleand to prevent retraction of saidpiston in the ret'eptacle. I

8. In a grease gun, in combination, a receptacle provided withltmgitudinal ribs, a piston movable longitudinally therein, said pistonbeing provided with knife edge portions, means for moving said piston inone direction longitudinally in saidreceptacle, said means being adaptedto causesaid knife edge portions of said piston to engage said ribs amlprevent retraction of said piston in li uid receptacle.

9. In a grease gun, in combination, a receptacle provided withlongitudinal ribs with a series of spaced projections, a piston movablelongitudinally therein, said piston being provided witb wcdge shaped'kni'le 'cdge portions, means for movingv said piston in one directionlongitudinally in said rcoptaclc, said moans being adapted to cause saidwedge shaped knife edge portions of said plston to engage said ribs andpro jections and prevent retraction of said piston in said receptacle.

10. In a greasecgun, in combination, a receptacle, a piston}, positionedtherein piston operating means adapted to move said pistonlongitudinally in said receptacle, and means adapted to render saidpiston. operating means inoperative to move said piston longitudinallyin said receptacle when said piston has been moved to one end of itstravel in said receptacle.

In a grease gun, in combination, a receptacle having a rib extendingl0ngit11dinally thereof from one end to a point adjacent the oppositeend, a piston positioned in said receptacle and adapted to be movedlongitudinally therein in engagement with .aid rib, .a. helixoperatively piston and adapted to move said piston longitudinally insaid receptaole'while said piston is in engagement witlrsaid rib butrendered inoperative to move said piston in either directionlongitudinally when the piston passes out of engagement with said rib.

Signed at the city, county and State of New York, this 29th (la of Dec.,1917.

v JOHN MAOGREGOR,

'45 engaging said

